Mehmet akçay

• Sivas Cumhuriyet University

Cloud point extraction (CPE) was used for the preconcentration of molybdenum (Mo), after the formation of a complex with Victoria pure blue BO (VPB+) in presence of excess thiocyanate and cetylpyridinium chloride (CPC) at pH 2.0, and further determination by flame atomic absorption spectrometry (FAAS) using Triton X-114 as surfactant. The main fact...

A cloud point extraction (CPE) method has been developed for the pre-concentration and simultaneous determination of lead [Pb(II)] and tin [Sn(II)] using Acridine Orange as complexing reagent and mediated by nonionic surfactant (Triton X-114) by flame atomic absorption spectrometry (FAAS). The main factors affecting analytical performance of CPE ha...

A simple, rapid, highly accurate and sensitive kinetic method is proposed for determining chromium(VI). The method is based on its catalytic effect on the oxidation of Celestine blue (CB+) by H2O2 in the presence of 2,2′-bipyridyl (Bipyr) and cetylpyridinium chloride (CPC) at pH 6.50. The reaction was monitored spectrophotometrically by measuring t...

A sensitive and selective method has been developed for the determination of chromium in water samples based on using cloud point extraction (CPE) preconcentration and determination by flame atomic absorption spectrometry (FAAS). The method is based on the complexation of Cr(III) ions with Brilliant Cresyl Blue (BCB) in the presence of non-ionic su...

Cloud point extraction (CPE) methodology has successfully been employed for the preconcentration of ultra-trace arsenic species in aqueous samples prior to hydride generation atomic absorption spectrometry (HGAAS). As(III) has formed an ion-pairing complex with Pyronine B in presence of sodium dodecyl sulfate (SDS) at pH 10.0 and extracted into the...

A novel catalytic kinetic method is proposed for the determination of Se(IV), Se(VI), and total inorganic selenium in water based on the catalytic effect of Se(IV) on the reduction of Celestine blue by sodium sulfide at pH 7.0 phosphate buffer. The fixed-time method was adopted for the determination and speciation of inorganic selenium. Under the o...

The simple and rapid preconcentration technique using cloud point extraction (CPE) was applied for the determination of As(V) and total inorganic arsenic (As(V) plus As(III)) in water samples by means of FAAS. As(V) has formed an ion-pairing complex with Pyronine B in the presence of cetyl pyridinium chloride (CPC) at pH 8.0 and extracted into the...

A cloud point extraction (CPE) method has been developed for the preconcentration of trace aluminum prior to its determination by flame atomic absorption spectrometry (FAAS). The CPE method is based on the complex of Al(III) with Xylidyl Blue (XB) and then entrapped in non-ionic surfactant Triton X-114. The main factors affecting CPE efficiency, su...

The M(PyDTC)2 (M: Cu, Co, or Ni) and CuPyDTC complexes, prepared by reactions of ammonium pyrrolidinedithiocarbamate with metal nitrates, are examined for qualitative analysis, speciation, and mutual separation using thin-layer chromatography systems. These complexes and their mixtures are spotted to the activated and non-activated thin layers of s...

Nitrite is a characteristic pollutant ion, which is ubiquitous within environmental and physiological systems, and occurs in water as an intermediate during the nitrogen cycle. Therefore, the detection and determination of its concentration at trace levels is extremely important in biological and environmental studies. A simple, sensitive and rapid...

A sensitive and relatively selective spectrophotometric method is proposed for the rapid determination of magnesium using Eriochrome black T (EBT) as a complexing agent in the presence of N-cetyl-N,N,N-trimethylammonium bromide (CTAB). The complex formation reaction between EBT and magnesium (II) is instantaneous in presence of NH 3 /NH 4 Cl buffer...

A multi-elements pre-concentration method was proposed for determination of Cu, Ni, Co, Mn, Pb, Zn and Cr from leaching solutions by flame atomic absorption spectrometry (FAAS). It has been investigated the enrichment performance of the three complexing reagents i.e., [8-hydroxyquinoline (8-HQ), dithizone (DT) and sodium diethyldithiocarbamate (NaD...

The separation and identification possibilities of a number of metal–dithizonate complexes were investigated by means of a TLC-IR sequential system. Dithizonate complexes of some metal cations were pre-pared in a predetermined optimum pH or pH range. Optimum separation conditions of these complexes and the reproducibility of their R f values were i...

The fly ash samples obtained from Kangal Power Plant were prepared for FAAS analysis by a new approach. The trace elements of the fly ash samples were leached with appropriate solvents under suitable conditions. The leaching method is known as an effective technique for substances dissolving very hard and refractory materials. The leaching effects...

An Ultrasonic Leaching Method (ULM) was developed for the analysis of manganese and lead on roadside soil samples in order to assess the pollution from motor vehicle exhaust. The variations in analyte recoveries by sonication periods were investigated and optimum recovery conditions were determined. The leachates of the soil samples, Mn and Pb, wer...

The aqueous phase photocatalytic degradation of Sirius Gelb GC used in the textile industry, was investigated. In order to optimize the working pH, three different dye solutions were prepared at pH 3.5; 7.0 and 11.0. One hundred cubic centimeter portions of the solution were irradiated with a low pressure UV lamb in the absence and presence of cata...

The reaction between Co(III)-EDTA and hypophosphite ion, catalyzed by Pd(II) was chosen as the indicator reaction. The inhibition kinetics of this catalytic reaction have been investigated by a mechanistic approach in the presence of some inhibitors. Catalysts other than PdCl2, that is Pt, Au, Ni salts, did not exhibit any effect on the reaction. A...

In this study, the reaction between Co(III)-EDTA and hypophosphite ion, catalyzed by Pd(II), was chosen as the indicator reaction. The inhibition kinetics of this catalytic reaction were investigated in the presence of iodide ion and the possibility of its analytical application was evaluated. Catalyzers other than PdCl2 (Pt, Au and Ni salts) were...

A simple and sensitive catalytic spectrophotometric method was developed for the determination of trace amounts of selenium. The method is based on the catalytic effect of selenium in form Se(IV) on the reduction of Maxilon Blue-SG by sodium sulfide. Indicator reaction is followed spectrophotometrically by measuring the absorbance change at λmax=65...

The reaction between Maxilon blue (MB +) and the sulfide ion is an ideal kinetic experiment in order to show the dependence of the reaction rate on the concentrations of reactants, ionic strength and temperature. By using excess concentrations of sulfide, the reaction or the disappearance of MB + was monitored spectrophotometrically and kinetically...

An alternative sample preparation method has been developed for destructive analysis of magmatic rock sample. The method simply included the crushing, HF treatmem and 1% HCl leaching steps of the rock samples under ultrasonic effects. There is no need to exhaust all of the sample through the operation. A reproducible and representative, partial rec...

A method of ultrasonic leaching has been developed for the destructive analysis of magmatic rock samples1. This method was applied to determine three new elements, Ca, Mg and Al, in magmatic rock samples. The accuracy of the ultrasonic leaching method (CULM) was tested using standard reference materials (SRMs) and the recovery ratio as K1 = CULM/CS...

The effects of ultrasonic excitation on the sequential leaching of Sr from sediments have been investigated. The sequential leaching scheme of Tessier partitions metals in sediments into exchangeable, carbonate bound, oxide bound, organic bound, and residual binding fractions. The Sr in the leachates was determined by flame atomic absorption spectr...

Solid phase extraction of ten commonly used pesticides on activated carbon has been investigated. Enrichment of these pesticides was successfully achieved at ppm levels and samples were then analysed using FT‐IR. The enrichment technique was employed for each pesticide sample individually and their complex mixtures. The FT‐IR technique was employed...

A Bio Collector - Ultrasonic Leaching Method (BC-ULM) was developed for the analysis of heavy metals (Pb, Cd,Cr, Ni, Cu, Fe and Al) on plant sprouts for the assessment of environmental pollution. Fabaceae Rabinia Pseudoacacia L. and Pinaceae Pinus Sylvertris L. sprouts were chosen as bio-collectors. The bio-collector sprouts were leached using 1% H...

The effects of ultrasonication on the selective extraction of adsorbed Sr and the recovery of total Sr from river sediment have been investigated using flame atomic absorption spectrometry. Results from ultrasonic extraction (UE) experiments were comparable to those of conventional procedures for adsorbed Sr but results for the recovery of total Sr...

Investigation of qualitative separation and identification possibilities of some metal-oxinate complexes by combination of TLC and IR-spectroscopy has been aimed. Optimum separation conditions of these metal complexes and the reproducibilities of their retention factors, Rf have been investigated on